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논문 기본 정보

자료유형
학술저널
저자정보
Matous, Karel (Department of Aerospace and Mechanical Engineering, University of Notre Dame) Maniatty, Antoinette M. (Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute)
저널정보
테크노프레스 Interaction and multiscale mechanics Interaction and multiscale mechanics 제2권 제4호
발행연도
2009.1
수록면
375 - 396 (22page)

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In the present work, the elasto-viscoplastic behavior, interactions between grains, and the texture evolution in polycrystalline materials subjected to finite deformations are modeled using a multiscale analysis procedure within a finite element framework. Computational homogenization is used to relate the grain (meso) scale to the macroscale. Specifically, a polycrystal is modeled by a material representative volume element (RVE) consisting of an aggregate of grains, and a periodic distribution of such unit cells is considered to describe material behavior locally on the macroscale. The elastic behavior is defined by a hyperelastic potential, and the viscoplastic response is modeled by a simple power law complemented by a work hardening equation. The finite element framework is based on a Lagrangian formulation, where a kinematic split of the deformation gradient into volume preserving and volumetric parts together with a three-field form of the Hu-Washizu variational principle is adopted to create a stable finite element method. Examples involving simple deformations of an aluminum alloy are modeled to predict inhomogeneous fields on the grain scale, and the macroscopic effective stress-strain curve and texture evolution are compared to those obtained using both upper and lower bound models.

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